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The realization of automatic frequency tracking is of great significance in ultrasonic transducer due to its wide application area in nowadays industrial manufacture. However, excessive overshoot current, serious overheating and long response time remain the urgent issue. To tackle these existing ultrasonic frequency tracking problem, this paper proposes a hybrid technique that integrates fuzzy control...
This article examines the process of constructing an experimental apparatus for control of corrosion damage of fuel element shells. Described below are the prerequisites and process of constructing the apparatus. Samples, subjected to artificial corrosion, have been prepared. Measurement results and their analysis are demonstrated.
A variety of applications using ultrasonic transducer is operating at high power in a low frequency range in industry. The resonance frequency shift and electrical impedance change is a common phenomenon in the application of high-power ultrasonic transducer. In order to achieve a stable or consistent results, it is important to track the resonance frequency. To solve these problems, various electrical...
The resonance characteristics of ultrasonic transducer are analyzed based on the equivalent circuit of transducer and the quantitative calculation of admittance circle, and a control method of frequency tracking based on variable step length is proposed, and the limits of step switching are deduced, and the control parameters of the control method based on variable step length is designed in this...
This paper describes a simple class-E inverter circuit design using matching technology to drive the ultrasonic welding system with zero voltage switching. The output voltage is feedback to control the oscillator frequency to arrive the self-tracking function. The results exhibited that the class-E inverter circuit can be effectively and stably applied on the high power ultrasound welding system.
Results of researches of influence of acoustical contacts between exchangeable operating tool and electro-acoustical transducer on mechanical and electrical characteristics of oscillatory system are presented in this article. Measured amplitude-frequency and phase-frequency dependence of oscillatory system with various types of operating tools are shown. Analyze of measured dependences is made. Searching...
This article is devoted to comparative researches of half-wave ultrasonic piezoelectric transducers which are made on various constructive schemas. Measuring results of amplitude-frequency and phase-frequency characteristics with operating tools of one-wave and half-wave length are used for their comparison. All operating tools are used in the ultrasonic therapeutic devices.
In this paper the genetic algorithm is used to optimization of parameters the equivalent electrical circuit of piezoelectric ceramic. Sandwich type piezoelectric ceramic transducer are the source of power ultrasounds when the vibration is activated by a voltage inverter. The output frequency of inverter most by equals the mechanical resonance frequency of the transducer and most by tuning with very...
The paper presents a control system for an ultrasonic welding device, based on a power inverter, working in commutation, at high frequency, with a frequency control system and an automatic equipment for command. The inverter fed an ultrasonic piezoelectric transducer to activate an ultrasonic welding tool. The frequency control system is based on a feedback after the estimated movement current through...
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